I asked the same thing on JU and got really no where so here is my post. Tell me your opinions:
O.k. got a YJ with an MPI kit. I think the fuel pump is going. The Jeep seems to ping and rattle a lot if I want to jump on the gas. The cat was changed less than 1,000 miles ago.
Now, I checked Hesco's site (
www.hesco.us ) and they have 2 of them. One regular replacement and one that provides higher pressure (70-90 psi.) The difference in price is $10.
Now here are my questions:
1) What is the normal pressure of and fuel pump for a 4.0L fuel pump?
2) Will using a higher pressure pump do anything bad? (This is an older engine with 130,000 + miles.)
And, on a different note:
3) What should the order of fuel delivery be?
a) fuel tank - pump - filter - engine
b) fuel tank - filter - pump - engine
Thanks for any help.